N. Saoulidou, Fermilab, MINOS Collaboration Meeting 10-13-05

1N. Saoulidou, Fermilab, ND/CC Parallel Session,

MINOS Collaboration Meeting 10-13-05

R1.18 : Data/MC Comparison of CC high level quantities

N. Saoulidou, Fermilab, MINOS Collaboration Meeting 10-13-05

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Outline • LE-10, PME, PHE compare Data &MC

using R1.18 (CC-like events)– Energy– Shower energy– Muon momenta– Y distribution (in energy slices also)

• Compare differences in previous quantities for CC-like events related with Low PH excess activity (Details discussed in Reco Meeting)

• Outline some shower related problems with R1.18

Conclusion/ On going Work

N. Saoulidou, Fermilab, MINOS Collaboration Meeting 10-13-05

3

Events, releases,Cuts

• June LE-10 data, May PME & PHE data, all proccesed with R1.18 w/o my cleaning technique for removing excess hit activity in ND.

• MC LE-10, PME and PHE proccesed with R1.18 w/o my cleaning technique for removing excess hit activity in ND.

• Use NN PID for selecting CC-like events (Also used David’s PID and simple track length cut and results are the same)

• All plots normalized to POTs. All plots are performed after cleaning low PH activity, Ratios of before and after cleaning show the differences.

• Used LINEAR version of shower energies for CC events since weighted had problems (It turns out that Linear has problems also…)

N. Saoulidou, Fermilab, MINOS Collaboration Meeting 10-13-05

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ANN PID

Data – MC agree well.

N. Saoulidou, Fermilab, MINOS Collaboration Meeting 10-13-05

5

Shower energy in data lower than MC. Shower energy calculation has problems so need to check again when problems fixed.

Shower Energy : CC-like events LE-10 PME PHE

N. Saoulidou, Fermilab, MINOS Collaboration Meeting 10-13-05

6 This shower energy estimation is quite problematic. The weighted energy estimation had problems as well.

Shower Energy Resolution vs Eshw true

LE-10

PME

PHEFAR LE

NEAR LE

N. Saoulidou, Fermilab, MINOS Collaboration Meeting 10-13-05

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BLACK : AFTER CLEANING RED : BEFORE CLEANING

Shower energy Ratios DATA/MC before – after cleaning

LE-10

PME

PHE 1. Shower energy reconstruction does change depending on whether low ph noise is removed or not

2. Shower energy increases as we remove low ph hits.

N. Saoulidou, Fermilab, MINOS Collaboration Meeting 10-13-05

8

Muon momenta in data lower than MC for PME and PHE effect not clearly seen in LE.

Muon Momenta : CC-like events LE-10 PME PHE

N. Saoulidou, Fermilab, MINOS Collaboration Meeting 10-13-05

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1. Ratios not affected by data cleaning (as expected)

2. In PHE and PME clear dip of ratio corresponding to shift of energy peaks.

3. This effect not visible…

Muon Momenta Ratios DATA/MC before – after cleaning

LE-10

PME

PHE

N. Saoulidou, Fermilab, MINOS Collaboration Meeting 10-13-05

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Energy in Data is shifted with respect to MC.

So, the problem with R1.18 , new MC e.t.c is still there.

Reconstructed Energy : CC-like events LE-10 PME PHE

N. Saoulidou, Fermilab, MINOS Collaboration Meeting 10-13-05

11

1. Ratios not affected by data cleaning (as expected)

2. In PLE , PHE and PME clear dip of ratio corresponding to shift of energy peaks.

3. Dip becomes less pronounce after “low ph cleaning”

4 . Dip moves with energy so most likely not cross-section…

Energy Ratios DATA/MC before – after cleaning

LE-10

PME

PHE

N. Saoulidou, Fermilab, MINOS Collaboration Meeting 10-13-05

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Y distributions don’t agree .

Y distribution : CC-like events LE-10 PME PHE

N. Saoulidou, Fermilab, MINOS Collaboration Meeting 10-13-05

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1. Ratios do get affected by low ph noise removal which affects shower formation especially

2 .The trend is very similar for all three energies.

Y Ratios DATA/MC before – after cleaning

LE-10

PME

PHE

N. Saoulidou, Fermilab, MINOS Collaboration Meeting 10-13-05

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If there was a dramatic reconstruction effect having to do with increasing activity in the detector as we go higher in energy then y ratios in energy slices should be different.

Y Ratios In Energy Slices Before Cleaning After Cleaning

N. Saoulidou, Fermilab, MINOS Collaboration Meeting 10-13-05

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Conclusions - Plans

Differences in muon momenta, shower energies and neutrino energy still there for NEW MCs and R1.18 (effect reduced)

Ratio of reco energy in data and MC indicates that differences are not to first order due to x-section uncertainties.

Shower energy resolution varies a lot as a function of energy (does that have the same effect in data and MC? ) ( also it varies a lot between near and far detectors)

Removing Low ph activity does not change muon momenta estimation (or track formation) but does change shower energy estimation in CC events.

This also affects total neutrino energy estimation and Y distributions.

Y distributions in energy slices do not look dramatically different for LE, PME and PHE which indicates that differences in energy of data and MC are not related with increasing detector activity due to higher energies.

Plan to further study effect of reconstruction (i.e slicing and different magnetic field maps) in ND CC neutrino energy estimation.

N. Saoulidou, Fermilab, MINOS Collaboration Meeting 10-13-05

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Tracks Proximity to Coil hole for contained interactionsRed MC , Black Data

LE

• The difference in “closest hit distance to coil hole” is dramatic

•The proximity to the coil would agree with lower track momenta in data.

pME

pHE